When is the best season to travel to Peru and South America?
If you want to make a priority in adventure tours like: trekking, mountain biking or other modalities in remote places, so the risk could be increased in the highlands especially in areas where there are landslides due the rainy season (from january to march, our summer in South America). But on the other hand if you are in places closer the main cities nearby, or in the coast, so there is not matter when you travel to South America; actually it would be more interesting keeping in mind especial dates like the carnival in different sites or the activities at the beaches.
If you want to make a priority in adventure tours like: trekking, mountain biking or other modalities in remote places, so the risk could be increased in the highlands especially in areas where there are landslides due the rainy season (from january to march, our Peru summer and South America). But on the other hand if you are in places doing the traditional or conventional tours closer the main cities nearby, or in the coast, so there is not matter when you travel to Peru; actually it would be more interesting keeping in mind especial holidays events.